prop mirroring
open Input.svelte.
The downside is you have to declare the props exported with export let again on the $$Props.
also, notice that since my $$Props extends from the input element, i use the $$restProps variable on the input component.
Open sign in route file. before trying to add a prop, press ctrl + space to show hints. it will hint everything defined under $$Props, plus the mirrored props from the input element.